new gemini api

feat: invert-mask option in UI and core; add docs (no secrets)

Streamlit: initialize UI at module import for HF Spaces

Spaces: remove Dockerfile, guard Streamlit execution to avoid bare-mode

Remove Gradio path; run Streamlit UI only

Fix upload flow indentation; show prompt when no image uploaded

Switch Space to Gradio UI: add Gradio app, update README and requirements

Update app.py

Fix canvas error

Initial commit